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-rw-r--r--lib/hard-locale.c47
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diff --git a/lib/hard-locale.c b/lib/hard-locale.c
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+/* hard-locale.c -- Determine whether a locale is hard.
+
+ Copyright (C) 1997-1999, 2002-2004, 2006-2007, 2009-2023 Free Software
+ Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#include "hard-locale.h"
+
+#include <locale.h>
+#include <stdlib.h>
+#include <string.h>
+
+bool
+hard_locale (int category)
+{
+ char locale[SETLOCALE_NULL_MAX];
+
+ if (setlocale_null_r (category, locale, sizeof (locale)))
+ return false;
+
+ if (!(strcmp (locale, "C") == 0 || strcmp (locale, "POSIX") == 0))
+ return true;
+
+#if defined __ANDROID__
+ /* On Android 5.0 or newer, it is possible to set a locale that has the same
+ name as the "C" locale but in fact uses UTF-8 encoding. Cf. test case 2 in
+ <https://lists.gnu.org/archive/html/bug-gnulib/2023-01/msg00141.html>. */
+ if (MB_CUR_MAX > 1)
+ return true;
+#endif
+
+ return false;
+}